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cockney
Joined: 07 Dec 2007
Posts: 31
Location: Bristol
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 Posted: Sat Apr 12, 2008 12:00 am Post subject: glow worm 120ff fan replacement |
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| Would a fan replacement on a Glowworm 120ff cause the system to kettle ?. And client stated that he has been told that i have set the fan at the wrong speed. PLEASE, for god sake indulge me !!!!!! |
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thescruff
Moderator
Joined: 03 May 2003
Posts: 4249
Location: Bath
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| Posted: Sat Apr 12, 2008 12:06 am Post subject: |
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An ROTFL emoticon.
There must be a really funny reply, but somehow I think you're serious. |
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cockney
Joined: 07 Dec 2007
Posts: 31
Location: Bristol
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| Posted: Sat Apr 12, 2008 12:14 am Post subject: glow worm 120ff fan replacement |
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| deadly, was having a quite beer with the other half and "BANG" he approached me, Complete bee in his bonnet. I felt like i have ruined his life!. I gotta go there 2morrow and face the p%*k (which is my time) and try and explain. Or should i just try and become a plumber that don't give a hoot ? |
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thescruff
Moderator
Joined: 03 May 2003
Posts: 4249
Location: Bath
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| Posted: Sat Apr 12, 2008 12:27 am Post subject: |
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Technically changing the fan has caused the problem, in so far as before, the boiler wasn't working.
The fan speed is not adjustable, and is controlled by the PCB.
The problem will be circulation or water shortage, could even be the hx scaling up.
Did you gas rate the boiler after you got it working, could be over gassed.
Whatever it's got nothing to do with the fan |
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cockney
Joined: 07 Dec 2007
Posts: 31
Location: Bristol
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| Posted: Sat Apr 12, 2008 12:53 am Post subject: glow worm 120ff fan replacement |
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| Checked gas (drop test) prior to any work commencing, all good diagnosed prob as fan. Replaced fan, running gas check good as. Checked full system reheat and left. Flue gas analysis good. Called back to balance system,no charge. Stated undersized pipe work in house additions. I think that his prop is the bill (internet, screw fix) charged £214.60 FAN, £25.00 call out,£12.50 tracing part(phone bill)£25.00 part pick up and fuel.£25.00 part installation TOTAL £302.10. |
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AlanE
Moderator
Joined: 29 Jun 2003
Posts: 1131
Location: Colchester Essex
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| Posted: Sat Apr 12, 2008 12:08 pm Post subject: |
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Question is WHAT caused fan to fail!
Consider this scenario - boiler has been overheating for some time, this overheating causes fan to fail. You come along, replace the fan, but the underlying fault is still there - boiler overheating.
Customer being their normal helpful type compleatly fail to mention previous overheating but since you replaced the fan they have someone to blame. |
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AGILE
Moderator
Joined: 04 Mar 2003
Posts: 76
Location: London/Midlands
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| Posted: Fri Apr 18, 2008 3:34 pm Post subject: |
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| thescruff wrote: |
The fan speed is not adjustable, and is controlled by the PCB.
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During boiler firing the fan operates at full speed all the time.
Kettling is caused by lime compounds on the water side of the main heat exchanger. That usually builds up over a considerable time and would have been present before the fan was changed.
The most common cause of kettling is lime compounds deposited as a result of too low a water flow through the heat exchanger or over gassing. Usually aided by leaks in the system causing repeated make up water ingress.
You will probably have to treat with FX3 or might get away with X200 if its mild.
Perhaps the old fan was very noisy and masked the kettling?
What was the outcome of your revisit?
Tony |
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